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AB^2= AD^2+ BD^2
AB^2= (2 akar 5)^2+ (4)^2
AB^2= 36
AB= 6 cm
AD/AB= BD/BC
2 akar 5/6= 4/BC
BC= 12 akar 5/5
AC^2= AB^2+ BC^2
AC^2= (6)^2+ (12 akar 5/5)^2
AC^2= 36+ 144/5
AC^2= 324/5
AC= 18 akar 5/5
CD= AC-CD
CD= 18 akar 5/5 - 2 akar 5
CD= 18 akar 5/5 - 10 akar 5/5
CD= 8 akar 5/5